Just bought a KWC M92 the other week, played with it last weekend and it ran great..even if it was a heavy chunk of metal. When I came home and picked up my TM HK45 tactical..that really felt like a toy.
The KWC is my first foray into Co2, there are more experienced people than I who've probably used a ton of them...but I was quite impressed..but the extra mags were expensive, cheapest I could find were from Bullseyecountrysport.
Just received a Cybergun 1911 NBB (same as KWC) CO2 and the (fixed) slide and the inner barrel are loose and rattle. As it's the non blowback, can't take slide off or do anything to remedy this so it's going back.
EDIT : Just did a bit of plinking with it and the barrel is actually fine it's just the slide around it. Annoying but it works as it should. Keeping it and it's pretty accurate too.